Materials Literature
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The morphological and chemical changes occurring during the thermal decomposition of weddelite, CaC 2 O 4 ·2H 2 O, have been followed in real time in a heating stage attached to an Environmental Scanning Electron Microscope operating at a pressure of 2 Torr, with a heating rate of 10 °C/min and an equilibration time o…
The gold crystal-forming E. coli polypeptide sequence, MHGKTQATSGTIQS, is one of several polypeptide sequences that interacts with gold interfaces and catalyzes the formation of Au crystals in solution, with nucleated Au crystals preferentially featuring the (111) interface. To date, there have been no experimental st…
Pitting corrosion of a duplex stainless steel is studied under straining conditions. An original method based on successive X-ray diffraction measurements was first used both to quantify the surface stresses and to determine the elastoplastic behavior in the close vicinity of the surface of metallic phases. The time t…
Transparent polydimethylsiloxane–metal oxide (PDMS–MxOy) hybrid materials have been studied as host matrices of Eu3+ ions for their application as optical devices. The versatility of these nanocomposites and the different nature of the metal–oxo domains allow the modulation of the emitting ion coordination and, theref…
New chelating radical ligands pzNNH, pzINH, and pzbisINH (3-pyrazolyl nitronyl nitroxide, 3-pyrazolyl imino nitroxide, and pyrazole-3,5-diyl bis(imino nitroxide), respectively) were prepared. Complexation of these ligands with Ag+ gave [Ag(pzNN)]n, [Ag(pzIN)]6, and [Ag(pzbisIN)]n containing the corresponding anionic f…
The synthesis of a series of bithiophenic precursors of electrogenerated conjugated polymers functionalized by bipyridine ligands is described. The precursor structure involves two polymerizable groups attached at both ends of a bipyridine ligand and fixed at an internal β-position of thiophene via an alkylsulfanyl or…
Growth factors are members of a large functional group of polypeptide regulatory molecules that influence the biological activities of responsive cells. In the last decade, the use of a variety of growth factors as therapeutic agents to improve wound healing and the viability of ischemic skin flaps has aroused conside…
The stable ordered mesoporous titanosilicate (Ti-JLU-20) has been successfully synthesized from an assembly of mixed surfactants (fluorocarbon and triblock copolymer surfactants) with preformed titanosilicate zeolite precursors at high temperature (180-220 degrees C), and catalytic tests show that Ti-JLU-20 has highly…
Experimental Ti-Au alloys (5, 10, 20 and 40 mass% Au) were made. Mechanical properties and grindability of the castings of the Ti-Au alloys were examined. As the concentration of gold increased to 20%, the yield strength and the tensile strength of the Ti-Au alloys became higher without markedly deteriorating their du…
A simple and template-free synthesis pathway was developed leading to hierarchical meso-macroporous aluminosilicates made of an assembly of macro-channels with openings between 0.5 and 2.0 microm and mesoporous walls.
Vanadium oxide films were synthesized by chemical vapor deposition from pure or diluted VO ( OC 3 H 7 ) 3 precursor. An annealing process at 500°C was required to obtain crystallized V 2 O 5 . X-ray diffraction patterns have pointed out the influence of the operating conditions for the vanadium oxide deposition on the…
The behavior of second-phase particles during anodizing of Al5052 alloy in 16 wt% sulfuric acid solution was investigated by confocal scanning laser microscopy (CSLM). Two different types of second-phase particles were observed in the Al5052 alloy, Al-Mg particles and Al-Mg-Fe particles. The Al-Mg particles showed a g…
Single-chamber solid oxide fuel cell (SOFC) experiments have been carried out at temperatures below 900°C with methane-air mixtures. Our study confirms previous results obtained by Hibino and co-workers with conventional materials like for the cathode and a NiO-yttria-stabilized zirconia (YSZ) cermet for the anode. In…
We report the syntheses, structures and magnetic properties of two decametallic Ni(II) clusters with unprecedented supertetrahedral cores, stabilised by the (hitherto unobserved) micro(6)-coordination modes of the tris-alkoxides [MeC(CH(2)O)(3)](3-) and [C(6)H(9)O(3)](3-).
Epoxy polymers are frequently used for electronic purposes, in particular for built up layers and micro-vias in advanced printed circuit boards. The adhesion of the plated metal layers to this polymer surface is of prime importance for the reliability of the interconnection. Chemical treatment of the polymer surface c…
The structure of YaaE from Bacillus subtilis was determined at 2.5-A resolution. YaaE is a member of the triad glutamine aminotransferase family and functions in a recently identified alternate pathway for the biosynthesis of vitamin B(6). Proposed active residues include conserved Cys-79, His-170, and Glu-172. YaaE s…
The magnetic properties of polymers prepared by polymerization of the magnetic cluster Mn12O12(acrylate)16 with various portions of ethyl acrylate as co-monomer are reported. According to SAXS studies, the clusters are homogeneously distributed in the polymer. Ac susceptibility measurements show superparamagnet-like b…
Mesoporous oxide thin films with a mixed silica/zirconia framework were reproducibly synthesised for the first time by a two-step dip-coating method. Different synthesis strategies were developed for the Si-rich and Zr-rich regions. These optical quality films are highly organised and oriented, stable, and exhibit amo…
We describe a newly developed scanned electrospinning technique that can be used to form a variety of one-dimensional polymeric nanostructures. It is a straightforward technique that enables the rapid fabrication of oriented polymeric nanowires as well as their integration with lithographically defined surfaces. It pr…
Thia-bridged tetra- and octa-poly(oxyethylene)-substituted metal free- and Ni(II) phthalocyanines have been synthesized from the corresponding phthalonitrile derivatives in the presence of the anhydrous metal salt (NiCl2) or a strong organic base. The new compounds have been characterized by elemental analyses, UV/vis…